A medical port according to the present invention is fixed to a container body part of a nutrient container and allows communication between the inside and outside of the container body part. The medical port comprises: a port body part (22)； a thin film (16) attached to the port body part, for blocking the flow of liquid inside the container body part to outside the nutrient container； a flow path opening member (19) which is attached to an attachment part (21) of the port body part； and a connection-maintaining member (19e) which can maintain a state of connection with a connector. The flow path opening member comprises: a communication part (19a) which includes a piercing part (194) and a flow path for enabling a liquid which fills the container body part to flow to outside the nutrient container； and a cylindrical part (19b), and the flow path opening member (19) can adopt a first state of attachment and a second state of attachment with respect to the attachment part (21).
